Its extruder&comma; cylinder and screw rods are made of quality alloy steel that have been nitrized and processed in a precision way&period; Hence it is sound in hardness&comma; durable in corrosion resistance&comma; The specially-designed screw is of sound quality in plasticizing&comma; which helps increase the production capacity&period; It is applied to blowing the plastic films like low density polythene &lpar;LDPE&rpar;&comma; high density polythene&lpar;HDPE&rpar; and linear low density polythene &lpar;LLDPE&rpar;&period; It is widely applied to producing the packing bags for foodstuff&comma; clothing&comma; rubbish bag and vest ones&period;